He flies quite a bit on United, though he's not seeing the point to the program (he couldn't redeem his miles for his very specific dates). He also goes to Taipei a lot, so EVA is a likely possibility.

but with UA requiring $$ spend for status in 2014, I don't think he'll get any significant status in 2014 on UA even if he's always on UA.

good point about US. I forgot about the AA thing.